/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.nutch.fetcher;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;


public class FetchNodeDb {

  private Map<Integer, FetchNode> fetchNodeDbMap;
  private int index;
  private static FetchNodeDb fetchNodeDbInstance = null;
  
  public FetchNodeDb(){    
    fetchNodeDbMap = new ConcurrentHashMap<>();
    index = 1;
  }
  
  public static FetchNodeDb getInstance(){
    
    if(fetchNodeDbInstance == null){
      fetchNodeDbInstance = new FetchNodeDb();
    }
    return fetchNodeDbInstance;
  }
  
  public void put(String url, FetchNode fetchNode){
    System.out.println("FetchNodeDb : putting node - " + fetchNode.hashCode());
    fetchNodeDbMap.put(index++, fetchNode);    
  }  
  public Map<Integer, FetchNode> getFetchNodeDb(){
    return fetchNodeDbMap;
  }
}